Question

How to define namespace in C++

Answer 1

#include <iostream>

namespace calc {  
    int x = 3, y = 7;  

    int mul() {  
        return(x * y);  
    }  
}  
      
int main() {  
    int result = calc::mul();  
    
    std::cout << result;  
    
    return 0;  
}  



/*
run:

21

*/

 

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